Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Influence of water loss on mechanical properties of superfine tailing–blast-furnace slag backfill
Highlights Static and dynamic strength were measured for SBB. The effect of water loss on SBB was assessed from the viewpoint of shrinkage of hydration products. The deformation field of SBB was calculated by DIC to illustrate the failure process in physical experiments. The failure process of SBB and negative effect of water loss on SBB were reproduced by PFC.
Abstract In this study, two types of solid waste, namely superfine tailings and blast-furnace slag, were used to prepare backfills for filling mined-out void and to prevent surface subsidence in a mine in China. The tailing, binder, and paste were investigated using laser particle size analyzer, X-ray diffraction, and scanning electron microscopy, respectively. The backfills’ strength with different water loss content was tested by uniaxial compressive tests and split Hopkinson pressure bar (SHPB) tests at strain rates ranging from 100 to 140 s−1. A high-speed camera, digital image correlation (DIC), and numerical simulation were used to analyze the failure process of backfills. Results indicate that the static/dynamic strength of this backfill decreased because of considerable water loss, which may be related to the shrinkage of hydration products, such as C–(A)–S–H gels. Numerical simulations reproduced the failure process of the backfill in SHPB tests in comparison with the strain field calculated by DIC, including micro crack initiation at early stage of loading.
Influence of water loss on mechanical properties of superfine tailing–blast-furnace slag backfill
Highlights Static and dynamic strength were measured for SBB. The effect of water loss on SBB was assessed from the viewpoint of shrinkage of hydration products. The deformation field of SBB was calculated by DIC to illustrate the failure process in physical experiments. The failure process of SBB and negative effect of water loss on SBB were reproduced by PFC.
Abstract In this study, two types of solid waste, namely superfine tailings and blast-furnace slag, were used to prepare backfills for filling mined-out void and to prevent surface subsidence in a mine in China. The tailing, binder, and paste were investigated using laser particle size analyzer, X-ray diffraction, and scanning electron microscopy, respectively. The backfills’ strength with different water loss content was tested by uniaxial compressive tests and split Hopkinson pressure bar (SHPB) tests at strain rates ranging from 100 to 140 s−1. A high-speed camera, digital image correlation (DIC), and numerical simulation were used to analyze the failure process of backfills. Results indicate that the static/dynamic strength of this backfill decreased because of considerable water loss, which may be related to the shrinkage of hydration products, such as C–(A)–S–H gels. Numerical simulations reproduced the failure process of the backfill in SHPB tests in comparison with the strain field calculated by DIC, including micro crack initiation at early stage of loading.
Influence of water loss on mechanical properties of superfine tailing–blast-furnace slag backfill
Liu, Bing (Autor:in) / Gao, Yong-Tao (Autor:in) / Jin, Ai-Bing (Autor:in) / Wang, Xue (Autor:in)
14.02.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
AOI , Area of interest , AP , Atomic percentage , CM , Cementing material , DIC , Digital image correlation , DIF , Dynamic increase factor , EDS , Energy-dispersive X-ray spectrometry , HS , High-speed , MIP , Mercury intrusion porosimetry , PFC , Particle flow code , SHPB , Split Hopkinson pressure bar , SSA , Specific surface area , UCS , Uniaxial compressive strength , CTB , Cemented tailings backfills , SBB , superfine tailing–blast-furnace slag backfill , Blast-furnace slag , Split Hopkinson pressure bar test , Water loss , Numerical simulation
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